2000 Giant XTC ds1 upgrades

I have a 2000 Giant XTC ds1 and would like to upgrade the front and rear shock. The shocks that came stock on the bike are a Fox Air Vanilla Float and a RockShox Judy XC fork. What are some shock's that would compliment this bike? Can it utilize a NRS suspension system using a Sid shock to eliminates pedal-induced bobbing? I have read some posts that said the Sid wears out quick and to forget about the NRS system and go with a Cane Creek AD12. Any help would be great. I am 6'3" 250lbs.

One more thing the bike came with Formula MD1 mechanical disk brakes. I can't seem to find replacement pads maybe they don't make them anymore. The disks have a four hole mounting pattern and it seems that everything is six hole now. What are my options? Are there any four hole caliper brakes left or will I have to upgrade hubs, disks, calipers and all?

I think you really need to look really hard at the dollars involved in a rebuild. The brakes might particularly be a problem if you have to get something new. Giant has gone from the ds1 to the NRS and now the Anthem so sticking money into a dated frame design is questionable. You could easily have $600 into the forks and brakes and when you were done the bike would still be worth maybe $400. For maybe a little more money you could pick up a used Specialized Enduro. I think the Enduro with the XL frame would be the perfect bike. The Giant VT might be another possibility but the XL might be a little big and the L too small. Look for a 2003-2004 either here or on EBay.